475 research outputs found
The effect of irradiance on production and growth of the marine bloom-forming dinoflagellate Gyrodinium aureolum
No full textThe morphological and physiological responses of cultured cells of the marine dinoflagellate Gyrodinium aureolum grown at various irradiance levels has been investigated. Production rates were determined at a range of light intensities in cultures acclimated to various irradiances using two techniques: the oxygen light and dark bottle method and the 14C-CO2 radiotracer technique. Growth rates of G. aureolum have also been measured in cultures grown at various light levels. Gyrodinium aureolum cells showed adaptation to low irradiances by increasing cellular levels of chlorophyll a and reducing cell volume and carbon content. The enhanced pigmentation of low light adapted cells resulted in improvement of both light saturated and light limited rates of photosynthesis in relation to cells grown at higher irradiances. Production rates normalized per chlorophyll a were similar for low and high light adapted G. aureolum cultures. These photosynthetic responses have been identified as an indication of increases in the number of photosynthetic units (PSU's) within the cell, under low light adaptation. A similar set of experiments have been conducted with the marine Chlorophyte Brachiomonas sp. This organism also displayed a number of photoadaptation responses on growth at low light levels and these have been compared with results obtained with Gyrodinium aureolum. Production rates have been measured in natural bloom populations of Gyrodinium aureolum, during a cruise to the Western approaches of the English Channel in July 1987 and an estimation of water column production in the bloom waters attempted. Physiological data obtained with the field populations of G. aureolum are compared with results from culture studies. Finally, a comparison of production measurements obtained with the oxygen flux and the 14C methods has been made and possible factors influencing the photosynthetic quotient discussed. (DX89575)</p
Impact of sea ice on the structure of phytoplankton communities in the northern Antarctic Peninsula
No full textThe seasonal advance and retreat of sea ice around the northern Antarctic Peninsula can have a significant impact on phytoplankton, mainly due to alterations in the availability of ice-free areas, micronutrient inputs by meltwater and variations in water column structure. The aim of this work was to evaluate the effect of sea ice conditions on phytoplankton biomass and community composition in an area off the northern Antarctic Peninsula, a region undergoing important warming processes. In two consecutive summer cruises (2013 and 2014), seawater samples were analysed for nutrients and phytoplankton (through HPLC-CHEMTAX approach), and measurements were made for water column physical structure evaluation. Two contrasting conditions were studied: a strong environmental gradient around the sea ice edge, with a marked meltwater signal (summer 2013) and the same area with little indication of meltwater and no detectable sea ice conditions (summer 2014). In the first year, the phytoplankton communities were massively dominated by nanoflagellates such as cryptophytes, small dinoflagellates and Phaeocystis antarctica, but with differences between stations with less influence of meltwater (dominance of dinoflagellates type B, mainly Gymnodinium spp., mean chlorophyll a = 1.37 mg m−3) and stations closer to the sea ice edge (dominance of cryptophytes, mean chlorophyll a = 0.98 mg m−3). In the second year, cryptophytes were apparently replaced by diatoms type B (mainly Pseudonitzschia spp., 24% contribution, mean chlorophyll a = 0.93 mg m−3), although dinoflagellates were also important. Therefore, there was a clear distinction between the phytoplankton communities under sea ice influence, where mainly cryptophytes were associated with shallow mixed layers and high water column stability in 2013 and an important presence of diatoms in 2014, associated with deeper mixed layers, lower silicic acid concentrations and higher magnitudes of both salinity and temperature, under very little sea ice influence. Gymnodinioid dinoflagellates were an important component in both years, apparently occupying sites/conditions less favourable to cryptophytes. These results support previous suggestions that climate factors leading to shortening of the sea ice season in the region do have an important impact particularly in shaping the dominance of the main phytoplankton functional groups in the region
Adomo's physiognomical image of Mahler: the convergence of music, painting, and language
No full textThis study makes a case for the manifestation of mannerism in the music of Mahler through a close reading of Adomo's monograph on the composer, concurrently supporting the theory that mannerism is a distinct style, not limited to fixed periods, conditions in art, or media. The label 'Mannerism' connotes the style of sixteenth century Italian fine art, circumscribed by various art historians in the twentieth century. This study argues that the style is evident beyond the constraints of the sixteenth century, through the investigation of its manifestations in different artworks, created both in earlier and more contemporary times. The argument is constructed from a detailed comparison of the characteristics of the style in the paintings of sixteenth century Italian artists Arcimboldo and Parmigianino, the early twentieth century music by Schoenberg and Mahler, and Virginia Woolfs last novel. The comparison is facilitated by the utilisation of Barthes's writings on Arcimboldo, John Ashbery's poem about one of Parmigianino's paintings, and, predominantly, Adomo's interpretation of Mahler. The study also addresses issues that concern a comparison between different media, such as the problematical nature of the convergence of the arts. For example, the comparison of linguistic elements in both Arcimboldo's and Mahler's artworks is difficult to conduct without implying that art or music become language; the notion of a painterly language, or a musical language is complex and ambiguous. The study deals with the issue of whether one medium has to be fundamentally similar to another, in order to identify common characteristics between the two. In accordance with Adorno's writings on this paradigm, the conclusion drawn supports the position that the style of mannerism can be identified as manifesting itself in different mediums, without the necessity to scrutinise the fundamental connection between music, painting and literary forms
On the Hilbert function of general fat points in P1xP1
No full textWe study the bi-graded Hilbert function of ideals of general fat points with same multiplicity in P1×P1. Our first tool is the multiprojective-affine-projective method introduced by the second author in previous works with A.V. Geramita and A. Gimigliano where they solved the case of double points. In this way, we compute the Hilbert function when the smallest entry of the bi-degree is at most the multiplicity of the points. Our second tool is the differential Horace method introduced by J. Alexander and A. Hirschowitz to study the Hilbert function of sets of fat points in standard projective spaces. In this way, we compute the entire bi-graded Hilbert function in the case of triple points
System architecture
No full textSolution Oriented Partnership is about the conception and development of solutions. More precisely: it is about industrialised, contextualised, sustainable solutions that are produced and delivered by networks of partners: the solution-oriented partnerships. It is also about a new idea of industrialization: an advanced industrialization with the capacity to bring a multiplicity of players together to collaborate in an effective way, with a view to sustainable objectives.
The book is organised in two parts: Themes, that discusses the nature of partner-based solutions, and Tools, that introduces methodological tools for their conception and development.
“System Architecture” is a chapter of the Themes and is focused on the ways to define system rules able to assure flexibility on one side and industrial production processes on the other side.
Partner-based solutions arises from the activity of a group of research centres and European enterprises, funded under the European Community 5th Framework Programme. This research, known as HiCS, Highly Customerised Solutions, coordinated by the author Luisa Collina, was an action research, the specific subject of which has been “food for people with reduced mobility”
Maria Antònia Oliver, traductora
No full textMaria-Antònia Oliver i Cabrer (Manacor, 1946) és una de les poques
traductores al català que han aprofundit en la teoria de la traducció i que han
plasmat els seus pensaments sobre paper. Coneixem a bastament el seu
vessant literari gràcies a un bon grapat d’estudis que s’han dut a terme des de
diverses universitats dels Països Catalans i també des d’algunes de fora de les
nostres fronteres. Amb tot, la faceta de torsimany sovint ha estat esmentada de
passada, malgrat hagi portat al català autors i autores de renom com ara
Virginia Woolf, Herman Melville, Italo Calvino o Mark Twain.
Maria-Antònia Oliver, traductora situa l’autora en el moment en què ha traduït,
se centra en la seva idea sobre la traducció, cataloga les seves traduccions i
visibilitza la figura d’una traductora prolífica.Maria-Antònia Oliver i Cabrer (Manacor, 1946) is one of the few
translators into Catalan who have gone into theory of translation and who have
embodied her ideas in some writings. Her literary aspect is well-known thanks
to some studies carried out from various universities in the Països Catalans as
well as some others from all over the world. However, her facet as a translator
is usually mentioned in passing, although she has brought to Catalan some
renowned authors such as Virginia Woolf, Herman Melville, Italo Calvino or
Mark Twain.
Maria-Antònia Oliver, traductora locates the author in the moment she has
translated, puts attention in her idea of translation, catalogues her works as a
translator and makes a prolific translator visible
Physical oceanography during GOAL cruise PATEX (2004, 2006, 2007, 2008 and 2009)
No full textThis dataset contains temperature, salinity, fluorescence, and dissolved oxygen measurements collected from 2004 to 2009 in the Patagonian shelf, between 35 and 55 degrees of south latitude. During this period, a total of 7 cruises were carried out in the area by the High Latitude Oceanography Group (GOAL-FURG). The Patagonian Experiment (PATEX) aims to collect biogeochemical and bio-optic data in the Patagonian shelf that will allow for a detailed study of microalgae blooms and quantitatively infer the importance of marine microalgae in the regional carbon cycle and exchanges of gases relevant to the greenhouse effect. Salinity and temperature were measured using CTD (conductivity, temperature, and depth), and fluorescence and dissolved oxygen were obtained using auxiliary sensors installed in the CTD
New insights on the dominance of cryptophytes in Antarctic coastal waters: A case study in Gerlache Strait
No full textChanges in phytoplankton composition from large diatoms to small cryptophytes and their implications to the food web have been previously associated with rapid warming of surface waters in the western Antarctic Peninsula (WAP). However, ecological and physiological attributes that favor dominance of these flagellates in the region have not been fully explored. The overall aim of this work was to characterize the phytoplankton pigments and assemblages in relation to environmental conditions during three successive summer cruises (2013, 2014 and 2015) in the Gerlache Strait − a coastal area in the northern WAP. Data on phytoplankton (through HPLC/CHEMTAX pigment analysis) and associated physical (water column structure) and chemical (macronutrients) parameters were determined. Cryptophytes were conspicuously found in shallow mixed layers, under stratified conditions, as the main contributors to total phytoplankton biomass. Their greatest contributions were associated with warmer surface waters at the northwestern sector of the strait. Other phytoplankton groups (Phaeocystis antarctica in 2013 and small diatoms in both 2014 and 2015) were also important components. Photoprotective carotenoids (mainly alloxanthin), with an important role in preventing photodamage caused by excess light, were closely linked with the dominance of cryptophytes at surface layers. The results of this study suggest that the prevalence of cryptophytes in WAP coastal waters can be, to a great extent, due to a particular ability of those small flagellates to successfully grow in highly illuminated conditions in shallow upper mixed layers and strong water column stratification
Precautionary Principle, Civil Liability and the Right to Health
No full textThe present essay deals with the impact of the so called precautionary principle on the civil liability regime, in particular in the field of the protection of human health. Firstly, the Author tries to give a definition of the precautionary principle and to frame it in its various legal sources: international, supra-national and domestic. In the second section, she analyses the applications of such principle in the field of human health protection and its relations with civil liability. To this aim, the Author takes into consideration different legal systems and in particular the French one and the Italian one
‘Talk talk talk …’ Virginia Woolf, Ireland and Maria Edgeworth
No full textThis article considers Woolf’s only visit to Ireland and her attitude to the country as revealed in her diary and in a review of a book about Maria Edgeworth. She considered the fault of the Irish to be their loquaciousness. Her diary reveals her belief that Irish literature had declined since Dean Swift. Woolf, both in her twenties and when she visited Ireland in 1934, revealed a certain antipathy to the country. She asserted, for example, that the Irish propensity to talk had prevented the production of literature of any quality after the eighteenth century. In the 1909 review, Woolf, while criticising the author of a book about Maria Edgeworth, attacks Edgeworth herself. But her words imply that she had not read Maria’s Irish novels. Bloomsbury’s ‘snobbery’ and Woolf’s Feminism throughout the essay are evident in her implicit criticism of the way that Edgeworth sacrificed love for duty. In dismissing Edgeworth’s achievement, Woolf betrays a degree of ignorance that is worth considering
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